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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 24, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity Under The Principal Option Plans
Option activity under the principal option plans as of June 24, 2012 and changes during the six months ended June 24, 2012 were as follows:
 
Number of
Shares

 
Weighted-
Average
Exercise
Price

 
Weighted-
Average
Remaining
Contractual
Term
(in years)

 
Aggregate
Intrinsic
Value
(in thousands)

Outstanding at December 25, 2011
2,600,805

 
$
19.54

 
4.39

 
$
512

Granted
460,670

 
11.13

 
 

 
 

Exercised
(35,419
)
 
8.87

 
 

 
 

Forfeited or expired
(142,048
)
 
16.33

 
 

 
 

Outstanding at June 24, 2012
2,884,008

 
$
18.48

 
4.47

 
$
—

Vested and expected to vest at June 24, 2012
2,884,008

 
$
18.48

 
4.47

 
$
—

Exercisable at June 24, 2012
2,383,699

 
$
19.76

 
3.45

 
$
—
Assumptions And Weighted-Average Fair Values Of Share-Based Payment Units Under Black-Scholes Option Pricing Model
The assumptions and weighted-average fair values were as follows:
Six months ended
June 24,
2012

 
June 26,
2011

Weighted-average fair value of grants
5.02

 
9.88

Valuation assumptions:
 

 
 

Expected dividend yield
0.00
%
 
0.00
%
Expected volatility
51.92
%
 
49.85
%
Expected life (in years)
5.05

 
4.96

Risk-free interest rate
0.872
%
 
2.178
%
Nonvested Service Based Restricted Stock Units
Nonvested service based restricted stock units as of June 24, 2012 and changes during the six months ended June 24, 2012 were as follows:
 
Number of
Shares

 
Weighted-
Average
Vest Date
(in years)

 
Weighted-
Average
Grant Date
Fair Value

Nonvested at December 25, 2011
617,672

 
0.79

 
$
21.29

Granted
202,795

 
 

 
$
10.80

Vested
(171,535
)
 
 

 
$
11.63

Forfeited
(33,219
)
 
 

 
$
18.13

Nonvested at June 24, 2012
615,713

 
1.28

 
$
20.70

Vested and expected to vest at June 24, 2012
612,803

 
1.28

 
 

Vested at June 24, 2012
62,825

 
—